From: Alexander Bulekov <alxndr@bu.edu>
Date: Mon, 1 Mar 2021 19:35:30 +0000 (-0500)
Subject: lan9118: switch to use qemu_receive_packet() for loopback
X-Git-Url: https://repo.jachan.dev/qemu.git/commitdiff_plain/37cee01784ff0df13e5209517e1b3594a5e792d1

lan9118: switch to use qemu_receive_packet() for loopback

This patch switches to use qemu_receive_packet() which can detect
reentrancy and return early.

This is intended to address CVE-2021-3416.

Cc: Prasad J Pandit <ppandit@redhat.com>
Cc: qemu-stable@nongnu.org
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com
Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---

diff --git a/hw/net/lan9118.c b/hw/net/lan9118.c
index abc796285a..6aff424cbe 100644
--- a/hw/net/lan9118.c
+++ b/hw/net/lan9118.c
@@ -680,7 +680,7 @@ static void do_tx_packet(lan9118_state *s)
     /* FIXME: Honor TX disable, and allow queueing of packets.  */
     if (s->phy_control & 0x4000)  {
         /* This assumes the receive routine doesn't touch the VLANClient.  */
-        lan9118_receive(qemu_get_queue(s->nic), s->txp->data, s->txp->len);
+        qemu_receive_packet(qemu_get_queue(s->nic), s->txp->data, s->txp->len);
     } else {
         qemu_send_packet(qemu_get_queue(s->nic), s->txp->data, s->txp->len);
     }